722 SCHEDULE PLANNING FOR A SMALL CONSTRUCTION PROJECTS Držislav Vidaković, B.Sc., Tamara Marić, M.Sc. University of Osijek, Faculty of Civil Engineering, Osijek University of Zagreb, Faculty of Civil Engineering, Zagreb dvidak@gfos.hr , tamara@grad.hr Abstract This paper elaborates possibilites of introducing a new cathegory in workforce time planning – a universal construction works master (UKV). The problem is being observed with regard to a decrease in labor productivity in relation with specialized workforce, decrease of interior reservs in creating work groups and time schedule, better optimalisation options and i regard to current construction practice. On a project model with an average representation of different groups of construction works the influence of different structure on predictable direct labor cost. That is being calculated considering the overall workhours required and in regard to cost increase due to introducing workers in the work process time and time again. This researches are yet performed only to small construction projects. Keywords: workforce schedule, universal construction works master (UKV), labor productivity, building practice, histograms optimalisation 1. Introduction Resources include everything that is needed for the completion of activities, the whole project is divided into, but it is qualified human workforce that is primarily being dealt with here. ¨The optimal determination of the needed human labor for the purpose of a task, is a more complex problem than determining the optimal use of physical resources and production tools resources¨[3, p.212] . The number and distribution of resources are besides the time, costs and the risk the main factors, which represent the basis for evaluation of the optimum building period. Time planning which relies on unrealisticaly chosen resources or disregards the planned resources during realization, will make only a dead letter out of a plan. So, everything relies on intiutive management without any basis for a later analysis, which is even worse on a long term because the whole concept of planning loses its credibility. Heterogeneous control of specified resources is an important part of preparing the basis for the optimum period calculation [8]. When optimilizing the number and distribution of resources in a plan, whether using mathematical or heuristic models, we always come to the so called ¨big combinatory problem¨, which can be better solved if there are less different kinds of resources. Furthermore, during realization it is easier to follow the resources divided into less categories, and research has shown that a better management controll positively correlates with employees’ performance [10].